PBS Space Time

Is It Irrational to Believe in Aliens?

Season 1 Episode 9 | 6m 49s

Aliens! Could humans really be alone in this expansive universe? And if we're not, how come we've never made contact with other intelligent life? Everyone's thought about it; especially members of the scientific community. Join Gabe as he presents some of the most popular theories that scientists use to rationalize their support or skepticism of the existence of aliens.

Aired: 10/28/15

Expires: 10/30/20

Rating: NR

Video has closed captioning.

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